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I use mine when out of town. Works well and has a lot of different programming options. It's not as intuitive to program and set up, though. Works on AA batteries and you just set it on your hood. The food compartment just spins around at your set time(s) and there is an adjustable opening to control how much food comes out. My hood isn't completely flat, but slightly curved, but the feeder stays on with its rubber feet. I'm still nervous it might slide off and fall into the water! Kind of expensive.

------------------------------The early bird may get the worm, but it's the second mouse that gets the cheese.

I like the design of resting on flat surface compared to others that clamp onto the tank's rim. It is easy to program. It does take awhile tho to figure out the tumbler to your desired amount of food, but with multible programming options, it's easy to compensate for variety of foods too. I use mine only for vacations and always use new batteries.